This set comes with three replacement blades for the Blackwing One-Step Long Point Sharpener. Each blade is made with German steel designed to bend to the One-Step sharpener's unique concave shape. 

To replace your sharpener's blade, simply unscrew the worn out blade from the sharpening unit, making sure to keep the nut and screw in a secure location. Set the old blade aside and align the new blade on the sharpening unit. Replace the screw and nut, and tighten until secure.